Ewald demmer



N0. 62|,800. Patented Mar. 28, |899. E. DEMMER. STOVE FDR LIGNITE` CAKE-S, PE-AT, &c.

(Application led Jan. 3, 1898.)

(No Model.)

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ATENT EVVALD DEMMER, OF BARMEN, GERMANY, ASSIGNOR OF ONE-HALF TO RUDOLF DISSELKAMP, OF SAME PLACE.

sT'ovE FOR LIGNITE cAKEs, PEAT, sto.

SPECIFICATION forming part of Letters Patent No. 621,800, dated March 28, 1899.

Application flied January 3, 1 898.

To all whom t may concern,.-

Beit known that I, EWALD DEMMER, a subject of the Emperor of Germany, and a resident of the city of Barmen, in the county of Rhenish Prussia, Germany, have invented certain new and useful Improvements in Stoves for Lignite Oakes, Peat, and the Like Fuel, of which the following is a full, clear, and exact specification, such as will enable others skilled in the art of this manufacture to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

The invention has reference to such stoves which permanently are burning and which are fired with fuel of less value-as, for instance, lignite peat and the like. Such fuel may be preferably used in coal-cake form. The stove is thus constructed that the bituminous gases produced from the said fuel cannot enter into the room, but are perfectly burned, and thatfor feeding the stove withv air such air will be taken from above the stove, where it is spoiled. The heating effect of my stove is therefore much greater than of a stove fired with ordinary coals.

The manner in which I carry my invention into effect is shown on the accompanying drawings, in which- Y Figure l illustrates a vertical section of the improved stove for lignite. Fig. 2 is a similar section at right angle to Fig. 1. Figs. 3 and et are horizontal sections along lines I I and II II of Fig. l.

The same letters of reference denote the same parts in the several figures of the drawings.

The reference-letter a denotes th'e outer casin g of the stove, which may have any convenient form. In the present example I have made it circular and is provided with a bottom l).

c is a bottom plate which is arranged in the lower part of the casing to provide a chamber d. On this, plate stands a second cylinder e, forming, with the casing a, a chamber or flue g, which is closed at the top by a suitable plate f. Ooncentrically to the cylinder e is arranged in the stove a fuel-chamber h,

- resting upon the plate c, with legs h'. Be-

Serial No. 665,398. (No model.)

tween the cylinder e and the fuel-chamber 7L is thus formed a chamber which is closed at its top by a plate 1,' and partitioned by a plate 7c in two chambers g g2. Both plates z' 7c have apertures l Z', the lower of which is adapted p, serving as an ash-pit and containing a pan p'. Over the pit is arranged in the bottom plate c the fire-grate c', having a second sliding grate c2, which is provided with pins c3, that project through the slots of the grate c for the purpose of stirring the ash when` being moved by its handle c4. Now the chamber d has connection to the flue g by slots q and also to the chamber g2fby a slot q', Fig. 4, these slots being cut in the bottom plate c and the room g2 being connected to the ashpit p by a small tube r. Two doors s s', the first for filling the shaft 71, with lignite cakes and the other for igniting the fuel and controlling the re, are hinged to the stove, the

Working of which is as follows: After filling the stove withv fuel, for which purpose the damper lo' is Withdrawn, and ignitin'g the lire the air-valve o is opened and air may run into the chamber h. The fire-gases evolving on the hearth descend through the back slot q' into the chamber d, and from there they pass through the slots q into the flue g, entering at the top part of it the exit-pipe n, through which they are issued into the chimney. On its long way the gases are abundantly fed with air, so that a large re may be kept in the stove.v If a small lire is required, the chamber h is shut off by the damper 7c. The feeding-air enters then the hearth through the openings ZZ', andthe blast-pipe m, which has a sucking action, furnishes only so much air as for a small burning of the fire is required. The gases are traveling the same way as before. If the air-valve is closed, the fuel is only glowing without being able to extinguish, as the upper part of the stove, serving as an air-reservoir, contains a large stock of air. The glowing ash drops into the ash-pit, and the gases which are here still evolved may escape through the pipe a into the room g2, where they go the prescribed Way. In such a manner no products of combustion can enter the rooin and spoil the air. The latter is, on the contrary, improved, as the air-feeding eontrivance is attached to the top portion of the stove and the air is sucked on from the upper layers of the room.

Having thus described my invention, I declare that what I clailn, and desire to secure by Letters Patent, is-

A stove having two eoncentricall y-arran ged casings as d, e a central combustion or fuel chamber as 7L Iitted with a movable damper, partition-plates i, 7o, with openings Z, Z' and. a blast-pipe m, attached to plate Z a horizontal gas-exit pipe as n, the chambers and iiues d, g, g g2 being connected by slots q, q respectively, forming communications between said chambers and iues an ash-pit p and a pipe r connecting the ash-pit with room g an airvalve o on the top of the stove all as illustrated, described and for the purpose set forth.

In testimony whereof I have hereunto set lny hand in the presence of two subscribing witnesses.

EWALD DEMMER. Witnesses:

R. E. JAHN,

OTTO KNIG. 

